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10. DESCRIPTION DU PROTOCOLE WIEGAND
Les données sont envoyées sur les lignes DATA 0 pour la logique «0» et DATA 1 pour la logique 1. Les deux lignes utilisent une
logique inversée, ce qui signifie qu'une impulsion basse sur DATA 0 indique un 0 et une impulsion basse sur DATA 1 indique un 1.
Lorsque les lignes sont élevées, aucune donnée n'est envoyée. Seule une des deux lignes (DATA 0/DATA 1) peut émettre des
impulsions.
Exemple : données 0010....
D0
D1
5V
0V
100 us
1 ms
0 0 10
5V
0V
Bit de données 0 = environ 100 us (microsecondes)
Bit de données 1 = environ 100 us (microsecondes)
Temps entre deux bits de données : environ 1 ms (milliseconde). Les deux lignes de données (D0 et D1) sont élevées.
Description pour le format Wiegand 26 bits
Chaque bloc de données est constitué d'un premier bit de parité P1, d'un en-tête fixe de 8 bits, d'un code d'utilisateur de 16 bits
et d'un deuxième bit de parité P2. Un bloc de données est représenté ci-dessous :
Bit de parité (bit 1) + en-tête 8 bits + code utilisateur 16 bits = 2 octets + bit de parité (bit 26)
P1 P2XXXXXXXX XXXXYYYY YYYYYYYY
Exemple : 170 31527
1 01 0 1 0 1 0 1 0 0 1 1 1 1 0 1 1 0 0 1 0 0 1 1 1
Remarque : les bits de parité sont calculés comme suit :
P1 = parité paire calculée sur les bits 2 à 13 ( )X
P2 = parité impaire calculée sur les bits 14 à 25 ( )X
E A AA A A A AABB B B B B B B B B B B B B B B O
Parité
Paire
Bit
Parité
Impaire
Bit
Code Site Code Utilisateur
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